/Engine/Source/Runtime/Core/Public/Internationalization/TextFormatter.h
Low-level version of Format that returns a string. This should typically only be used externally when rebuilding the display string for some formatted text
static [FString](API\Runtime\Core\Containers\FString) FormatStr ( const [FTextFormat](API\Runtime\Core\Internationalization\FTextFormat) & InFmt, const [TArray](API\Runtime\Core\Containers\TArray)< [FFormatArgumentData](API\Runtime\Core\Internationalization\FFormatArgumentData) > & InArguments, const bool bInRebuildText, const bool bInRebuildAsSource )